. Elementary and dental radiography . Fig. 103. Radiograph made from the pose shown in Fig. 102. The arrows point to unerupted upper and lower third molars. in Figs. 105 and 106. This radiograph shows also the frontal sinusesand the ethmoidal cells. To obtain the best results when making such apicture a diaphragm should be used. To avoid unnecessary straining ofthe tube it is well to use an intensifying screen. Instead of using theradiographic table and having the patient posed as in Fig. 104. the patientmay assume a pose similar to Fig. 98. A picture of one of the antra, or a part of it. may
. Elementary and dental radiography . Fig. 103. Radiograph made from the pose shown in Fig. 102. The arrows point to unerupted upper and lower third molars. in Figs. 105 and 106. This radiograph shows also the frontal sinusesand the ethmoidal cells. To obtain the best results when making such apicture a diaphragm should be used. To avoid unnecessary straining ofthe tube it is well to use an intensifying screen. Instead of using theradiographic table and having the patient posed as in Fig. 104. the patientmay assume a pose similar to Fig. 98. A picture of one of the antra, or a part of it. may be made on a film 1 l-l DEXTAL RADIOGRAPHY held in the mouth, the pose being quite similar to Fig. 85. A pictureof one antrum can also be made on a plate by a modification of the pose,shown in Figs. 101 and 102. (Fig. 107.). Fig. 104. Pose for making radiograph of the antra of Highmore. The advantages of the small dental radiographs fldcantafles made on films held in the mouth over the large plate of film radiographs are: (i) There is no superimpositiorj Radiographs. of shadows, and therefore a clearer, better radio- graph can he made on the small film. (2) The patient may 1>< seated in the dental chair while the exposure is made when small films are used. (3) The time of exposure is shorter for the small films. (4) Small machines with which it is necessary to make an MAKING DliXTAL RADIOGRAPHS i5
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